Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1089/ast.2006.6.451 |
Oxidant enhancement in martian dust devils and storms: Storm electric fields and electron dissociative attachment | |
Delory, Gregory T.; Farrell, William M.; Atreya, Sushil K.; Renno, Nilton O.; Wong, Ah-San; Cummer, Steven A.; Sentman, Davis D.; Marshall, John R.; Rafkin, Scot C. R.; Catling, David C. | |
通讯作者 | Delory, Gregory T. |
来源期刊 | ASTROBIOLOGY
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ISSN | 1531-1074 |
EISSN | 1557-8070 |
出版年 | 2006 |
卷号 | 6期号:3页码:451-462 |
英文摘要 | Laboratory studies, numerical simulations, and desert field tests indicate that aeolian dust transport can generate atmospheric electricity via contact electrification or "triboelectricity." In convective structures such as dust devils and dust storms, grain stratification leads to macroscopic charge separations and gives rise to an overall electric dipole moment in the aeolian feature, similar in nature to the dipolar electric field generated in terrestrial thunderstorms. Previous numerical simulations indicate that these storm electric fields on Mars can approach the ambient breakdown field strength of similar to 25 kV/m. In terrestrial dust phenomena, potentials ranging from similar to 20 to 160 kV/m have been directly measured. The large electrostatic fields predicted in martian dust devils and storms can energize electrons in the low pressure martian atmosphere to values exceeding the electron dissociative attachment energy of both CO2 and H2O, which results in the formation of the new chemical products CO/O- and OH/H-, respectively. Using a collisional plasma physics model, we present calculations of the CO/O- and OH/H- reaction and production rates. We demonstrate that these rates vary geometrically with the ambient electric field, with substantial production of dissociative products when fields approach the breakdown value of similar to 25 kV/m. The dissociation of H2O into OH/H- provides a key ingredient for the generation of oxidants; thus electrically charged dust may significantly impact the habitability of Mars. |
英文关键词 | Mars dust storm dust devil electric field oxidant habitability |
类型 | Article |
语种 | 英语 |
国家 | USA ; England |
收录类别 | SCI-E |
WOS记录号 | WOS:000238715900007 |
WOS关键词 | ART. NO. E03004 ; CROSS-SECTIONS ; SURFACE-CHEMISTRY ; RED SPRITES ; BLUE JETS ; MARS ; ATMOSPHERE ; MODEL ; IONOSPHERE ; DISCHARGES |
WOS类目 | Astronomy & Astrophysics ; Biology ; Geosciences, Multidisciplinary |
WOS研究方向 | Astronomy & Astrophysics ; Life Sciences & Biomedicine - Other Topics ; Geology |
来源机构 | University of California, Berkeley |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/150796 |
作者单位 | (1)Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA;(2)NASA, Goddard Space Flight Ctr, Extraterr Phys Lab, Greenbelt, MD 20771 USA;(3)Univ Michigan, Dept Atmospher Ocean & Space Sci, Ann Arbor, MI 48109 USA;(4)Duke Univ, Dept Elect & Comp Engn, Durham, NC USA;(5)Univ Alaska, Inst Geophys, Fairbanks, AK USA;(6)SETI Inst, Mountain View, CA USA;(7)SW Res Inst, Boulder, CO USA;(8)Univ Washington, Dept Atmospher Sci, Astrobiol Program, Seattle, WA 98195 USA;(9)Univ Bristol, Dept Earth Sci, Bristol, Avon, England |
推荐引用方式 GB/T 7714 | Delory, Gregory T.,Farrell, William M.,Atreya, Sushil K.,et al. Oxidant enhancement in martian dust devils and storms: Storm electric fields and electron dissociative attachment[J]. University of California, Berkeley,2006,6(3):451-462. |
APA | Delory, Gregory T..,Farrell, William M..,Atreya, Sushil K..,Renno, Nilton O..,Wong, Ah-San.,...&Catling, David C..(2006).Oxidant enhancement in martian dust devils and storms: Storm electric fields and electron dissociative attachment.ASTROBIOLOGY,6(3),451-462. |
MLA | Delory, Gregory T.,et al."Oxidant enhancement in martian dust devils and storms: Storm electric fields and electron dissociative attachment".ASTROBIOLOGY 6.3(2006):451-462. |
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